What parameters do we need to predict & detect imminent danger caused by a charging battery?

Dear Engineers,

Every month or year, charging batteries cost human lives and total household destruction.

I have successfully developed a Flame Detector which sends alert to internet broker over a wifi router once it detects "flame" near a charging battery.

Then, I want to improve it and add some more parameters to predict & detect imminent danger caused by a charging battery.

What suggestions could you make to improve my flame detector design? Thanks for your comments.

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0 battlecoder 9 months ago

If you have data of batteries that have failed, and the conditions under which they did, you could create a small predictive model. Three failure modes that are common are batteries being exposure to high temperatures, physical damage / punctures, and excess current consumption (for example through a short circuit).
There's actually an Open Data Set with such experiments, available for free:

Described here: https://www.sciencedirect.com/science/article/pii/S0378775324000570#da0010
Available to download here: https://www.nrel.gov/transportation/battery-failure.html

Now, the dataset gets really technical with their measurements, some of which you can't really replicate without very specialized equipment, but it should have some temperature readings associated to even their short circuit tests, and you could use that. If you can measure the discharge rate and temperature you are probably half way there.

Also based on that dataset; if you can measure the "mass" of the battery you could detect if it's losing mass in any way (i.e: it's leaking or venting), but I assume you would require an extremely accurate sensor for that.

Another idea: If you are working with Li-Po batteries, an additional sensor you could have is one of those flexing/strain sensors placed length-wise to detect swelling.
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0 HKPhysicist 9 months ago in reply to battlecoder

Cool!

Very high-end experimental apparatus! Thanks for sharing!
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0 HKPhysicist 9 months ago in reply to battlecoder

Cool!

Very high-end experimental apparatus! Thanks for sharing!
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